Structure for reducing noise and vibration of scroll compressor

ABSTRACT

A structure for reducing noise and vibration of a scroll compressor, including an outer casing connected-combined with a suction pipe and discharge pipe respectively, an inner casing combined with the inner circumferential surface of the outer casing, a driving motor combined with the inner circumferential surface of the inner casing, for generating a rotation force, a driving shaft combined with a rotor for transmitting the rotation force, a fixed scroll for forming a plurality of compression pockets which continuously move, combined with an orbiting scroll orbiting eccentrically combined with the driving shaft and the orbiting scroll and forming a discharge port, a frame fixed-combined on the inner circumferential surface of the inner casing, for supporting the driving shaft and an elastic supporting means for elastically supporting both ends of the outer casing and inner casing can efficiently reduce noise and vibration generated in the whole compressor by attenuating the noise and vibration generated in compressing the refrigerant gas using the elastic member between the inner casing and outer casing.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a structure for reducing noiseand vibration of a scroll compressor, and particularly to a suction headof a structure for reducing noise and vibration of a scroll compressorcapable of reducing noise and vibration generated in driving acompressor, by separated-assembling a vibration unit and compressingunit from a casing.

[0003] 2. Description of the Background Art

[0004] Generally, a compressor changes mechanical energy into latentenergy of compressive fluid and conventionally is classified into areciprocating-type, scroll-type, centrifugal-type and vane-type.

[0005] Among these, the scroll-type compressorsucks/compresses/discharges gas using a rotary element as thecentrifugal-type or vane-type unlike the reciprocating-type which uses alinear reciprocating movement of a piston.

[0006]FIG. 1 is a longitudinal sectional view showing an example of aconventional scroll compressor.

[0007] The conventional scroll compressor includes a casing 1 filledwith oil to a certain height, a main frame 2 and sub frame 3 which arefixed at upper and lower sides of the inner circumferential surface ofthe casing 1, a driving motor which is positioned between the main frame2 and sub frame 3, being composed of a stator 4A and rotor 4B, a drivingshaft 5 pressed at the center portion of the rotor 4B of the drivingmotor 4, for transmitting a driving force generated in the driving motor4 penetrating the main frame 2, an orbiting scroll 6 placed on the uppersurface of the main frame 2 combined to the driving shaft 5, a fixedscroll 7 combined to the orbiting scroll 6 and fixed on the uppersurface of the main frame 2 to form a plurality of compression pockets,a high/low pressure separation plate 8 combined on the rear surface ofthe fixed scroll 7, for dividing the inner portion of the main frame 2into a suction pressure area and a discharge pressure area and anon-return valve assembly 9 combined on the rear surface of the fixedscroll 7, for preventing a reverse flow of discharged refrigerant gas.

[0008] The casing 1 has a suction pipe (SP) at one side and a dischargepipe (DP) at the other side centering around the high/low pressureseparation plate 8. Accordingly, the suction pipe (SP) is connected to asuction pressure area and the discharge pipe (DP) is connected to adischarge pressure area.

[0009] The main frame 2 and the sub frame 3 are all fixed on the innercircumferential surface of the casing 1 by the method of welding and thelike and the fixed scroll 7 is fixed-combined on the lower surface ofthe high/low pressure separation plate 8.

[0010] On the corresponding surfaces of the orbiting scroll 6 and fixedscroll 7, wraps 6A and 7A meshed each other being continuously moved,which form an involute curve to form a plurality of compression pocketsare formed.

[0011] In the drawings, undescribed reference numeral 7 b designates asuction port, 7 c designates a discharge port and 0 designates an oilfeeder.

[0012] Hereinafter, the operation of the conventional scroll compressorwith the above construction will be described as follows.

[0013] First, when a power is applied to the stator 4A of the drivingmotor 4, the rotor 4B rotates with the driving shaft 5 at the inner sideof the stator 4A and the orbiting scroll 6 orbits as long as aneccentric distance. At the same time, a wrap 6 a of the orbiting scroll6 forms a plurality of compression pockets between itself and the wrap 7a of the fixed scroll 7 and the compression pocket moves to the centerside of the scrolls by the continuous orbiting movement of the orbitingscroll 6. The compression pocket sucks/compresses/discharges refrigerantgas as the volume of the pocket is reduced.

[0014] However, in the conventional scroll compressor, the driving shaft5 for transmitting a power of the vibration unit to a compressing unitis combined to the main frame 2 and sub frame 3 and vibration of thecompressing unit is transmitted to the exterior of the casing 1 andnoise and vibration are generated as the main frame 2 and the sub frame3 are abutted-combined on the casing 1.

[0015] Also, a portion of the casing 1 forms a discharge chambertogether with the high/low pressure separation plate 8 but in this case,the refrigerant gas with high pressure is collided with the casing 1 andincreases vibration and noise.

[0016] Also, the discharge pipe (DP) is directly connected to thedischarge chamber composed of the casing 1 and high/low pressureseparation plate 8 and accordingly vibration and noise by discharge gaswith high pressure can not be reduced.

SUMMARY OF THE INVENTION

[0017] Therefore, the present invention provides a structure forreducing noise and vibration of a scroll compressor with low noise andvibration by reducing vibration of a compressing unit and vibration unittransmitted to an exterior of a casing.

[0018] To achieve these and other advantages and in accordance with thepurpose of the present invention, as embodied and broadly describedherein, there is provided a structure for reducing noise and vibrationof a scroll compressor including an outer casing connected-combined witha suction pipe and discharge pipe respectively, an inner casing combinedwith the inner circumferential surface of the outer casing, a drivingmotor combined with the inner circumferential surface of the innercasing, for generating a rotation force, a driving shaft combined with arotor for transmitting the rotation force, a fixed scroll for forming aplurality of compression pockets which continuously move, combined withan orbiting scroll orbiting eccentrically combined with the drivingshaft and the orbiting scroll and forming a discharge port, a framefixed-combined on the inner circumferential surface of the inner casing,for supporting the driving shaft and an elastic supporting means forelastically supporting both ends of the outer casing and inner casing.

[0019] The foregoing and other, features, aspects and advantages of thepresent invention will become more apparent from the following detaileddescription when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are included to provide afurther understanding of the invention and are incorporated in andconstitute a part of this specification, illustrate embodiments of theinvention and together with the description serve to explain theprinciples of the invention.

[0021] In the drawings:

[0022]FIG. 1 is a longitudinal sectional view showing an example of aconventional scroll compressor;

[0023]FIG. 2 is a longitudinal sectional view showing an example of astructure for reducing noise and vibration of a scroll compressor inaccordance with the present invention; and

[0024]FIG. 3 is a modified example and main portion of the structure forreducing noise and vibration of the scroll compressor in accordance withthe present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Reference will now be made in detail to the preferred embodimentsof the present invention, examples of which are illustrated in theaccompanying drawings.

[0026] Reference numeral which are same as the conventional artdesignates the same reference numeral and the description will beomitted.

[0027] The scroll compressor in accordance with the present inventionincludes an outer casing 11 connected to a suction pipe (SP) anddischarge pipe (DP) and filled with oil to a certain height, an innercasing 12 elastically supported in the outer casing 11, a main frame 13and sub frame 14 which are fixed at upper and lower sides of the innercircumferential surface of the inner casing 12, a driving motor 15 whichis positioned between the main frame 13 and sub frame 14, being composedof a stator 15A and rotor 15B, a driving shaft 16 pressed at the centerportion of the rotor 15B of the driving motor 15, for transmitting adriving force generated in the driving motor 15, penetrating the mainframe 13, an orbiting scroll 17 placed on the upper surface of the mainframe 13 combined to the driving shaft 16, a fixed scroll 18 combined tothe orbiting scroll 17 and fixed on the upper surface of the main frame13 to form a plurality of compression pockets, a non-return valveassembly 19 combined to accommodate the discharge port 18 c of the fixedscroll 18, for preventing a reverse flow of the compressed refrigerantgas, a discharge plenum 20 combined on the rear surface of the fixedscroll 18 to accommodate the non-return valve assembly 19 and a looppipe 21 having an end connected to the discharge plenum 20 and the otherend connected to the discharge pipe of the outer casing 11.

[0028] At least 3 outer supporting protrusion portions 11 a are formedhaving a same height on the inner circumferential surface and at leastinner supporting protrusion portions 12 a are formed at the position ona perpendicular line opposed to the outer supporting protrusion portion11 a on the outer circumferential surface of the inner casing 12.

[0029] Spring fixing members 23 a and 23 b are inserted-combined at theouter supporting protrusion portion 11 a and the inner supportingprotrusion portion 12 a and an elastic member composed of the coilspring 22 for electrically supporting the inner casing 12 on the outercasing 11 is positioned on the opposed surface of the spring fixingmember 23 a and 23 b.

[0030] Hereinafter, a modified embodiment of the structure for reducingnoise and vibration of the scroll compressor in accordance with thepresent invention will be described with reference to the accompanieddrawings.

[0031] First, as shown in FIG. 3, a plurality of elastic mounting holes12 b are formed having a same height at a certain portion of the innercasing 12 and the outer supporting protrusion portions 11 a are combinedon the inner circumferential surface of the outer casing 11 penetratingthe elastic mounting holes 12 b. A plurality of spring fixing members 23a are combined at a side of the outer supporting protrusion portion 11a.

[0032] Then, a plurality of spring fixing members 23 b are combinedhaving a same height in a certain portion of the main frame 13 and anelastic member composed of a compression coil spring for supporting theinner casing 12 on the outer casing 11 is positioned on the opposedsurface between the plurality of spring fixing members 23 b and springfixing members 23 a, thus to reduce the outer diameter of the wholecompressor.

[0033] Also, though not described with a drawing, the inner casing 12can be supported by hanging the upper end on the outer casing 11 orsupporting the lower surface of the inner casing 12 with the bottomsurface of the outer casing 11.

[0034] It is desirable that the inner casing 12 has a lower end which iselastically supported having a certain height difference from the bottomsurface of the outer casing 11.

[0035] Also, it is desirable that the lower end of the driving shaft 16is at least formed longer than the lower end of the inner casing 12 toattenuate vibration generated when oil is sucked up with an oil feederO.

[0036] The discharge plenum 20 can be formed by continuously connectinga plurality of discharge spaces horizontally or vertically.

[0037] Also, it is desirable that the loop pipe 21 is formed as a springpipe to set off the vibration generated in compressing and dischargingand bound in various forms between the outer casing 11 and the innercasing 12 to suck vibration by itself. More desirably, it is desirablethat the loop pipe 21 is connected to the discharge pipe after beingbound not abutted on the inner circumferential surface of the outercasing 11.

[0038] Undescribed reference numerals 17 a and 18 a are wraps ofrespective scrolls.

[0039] Hereinafter, the operation and effect of the structure forreducing noise and vibration of the scroll compressor in accordance withthe present invention will be described as follows.

[0040] First, when a power is applied to the stator 15A of the drivingmotor 15, the orbiting scroll 6 orbits as long as an eccentric distanceas the rotor 15B rotates together with the driving shaft 16 at the innerside of the stator 15A. A wrap 17 a of the orbiting scroll 17 forms aplurality of compression pockets which are composed of pairs betweenitself and the wrap 18 a of the fixed scroll 18 by performing orbitingmovement at a distance of the orbiting diameter centering around theshaft center by the oldham's coupling (no reference numeral) and thecompression pocket moves to the center side of the scrolls by thecontinuous orbiting movement of the orbiting scroll 17. Accordingly,volume of the scroll is reduced and the sucked refrigerant gas iscompressed, thus to discharging the compressed gas after the gasconsecutively passes the discharge plenum 20, loop pipe 21 and dischargepipe (DP).

[0041] At this time, under the condition that the orbiting scroll 17 ismeshed with the fixed scroll 18, vibration is generated in compressingrefrigerant gas by the orbiting movement. However, as the main frame 13supporting the orbiting scroll 17 and fixed scroll 18 is fixed on theinner casing 12 and the inner casing 12 is elastically supported by theelastic member such as the compression coil spring 22, the vibrationgenerated in compressing the refrigerant gas is prevented from beingsucked to the compression coil spring between the inner casing 12 andouter casing 11, attenuated and transmitted to the outer casing 11.

[0042] On the other hand, in the process that the compressed refrigerantgas is discharged from the compression pocket to the discharge plenum20, vibration by a pulsation pressure of the refrigerant gas isgenerated but the vibration is attenuated at the discharge plenum 20,thus to reduce the whole compressor vibration.

[0043] Particularly, in case of forming the discharge space of thedischarge plenum 20 into many spaces, the compressed refrigerant gaspasses respective discharge spaces and attenuated, thus to reduce noiseof the compressor more.

[0044] Also, as the loop pipe 21 which is lengthened-positioned betweenthe dishened-positioned between the disge pipe (DP) having its ownelasticity is bound on the outer diameter of the inner casing 12 orcombined by binding itself Therefore, in the structure for reducingnoise and vibration of the scroll compressor in accordance with thepresent invention, the vibration generated in compressing therefrigerant gas is attenuated by the elastic member between the innercasing and outer casing by fixing the compressing unit and the vibrationunit on the inner casing and combining the outer casing to the outerside of the inner casing to be elastically supported.

[0045] As the present invention may be embodied in several forms withoutdeparting from the spirit or essential characteristics thereof, itshould also be understood that the above-described embodiments are notlimited by any of the details of the foregoing description, unlessotherwise specified, but rather should be construed broadly within itsspirit and scope as defined in the appended claims, and therefore allchanges and modifications that fall within the metes and bounds of theclaims, or equivalence of such metes and bounds are therefore intendedto be embraced by the appended claims.

What is claimed is:
 1. A structure for reducing noise and vibration of ascroll compressor, comprising: an outer casing connected-combined with asuction pipe and discharge pipe respectively; an inner casing combinedwith the inner circumferential surface of the outer casing; a drivingmotor combined with the inner circumferential surface of the innercasing, for generating a rotation force; a driving shaft combined with arotor for transmitting the rotation force; a fixed scroll for forming aplurality of compression pockets which continuously move, combined withan orbiting scroll orbiting eccentrically combined with the drivingshaft and the orbiting scroll and forming a discharge port; a framefixed-combined on the inner circumferential surface of the inner casing,for supporting the driving shaft; and an elastic supporting means forelastically supporting the outer casing and inner casing.
 2. Thestructure of claim 1, wherein the elastic supporting means comprises: anouter supporting protrusion portion, three or more of which are formedalong the inner circumferential surface at a same height as the innercircumferential surface of the outer casing; a spring fixing memberinserted-combined on one side surface of the outer supporting protrusionportion; an inner supporting protrusion portion, three or more of whichare formed on the perpendicular line opposed to the outer supportingprotrusion portion on the outer circumferential surface of the innercasing; a spring fixing member inserted-combined on one side of theinner supporting protrusion portion; and an elastic member positionedbetween the opposed surfaces of the spring fixing members, forelastically supporting the inner casing on the outer casing.
 3. Thestructure of claim 2, wherein the outer supporting protrusion portionand the inner supporting protrusion portion are protruded-formed on asame perpendicular line, having a certain height difference.
 4. Thestructure of claim 1, wherein the elastic supporting means comprises: anelastic member mounting hole, three or more of which are formed beingpenetrated at a certain portion of the inner casing; an outer supportingprotrusion portion, three or more of which are formed along the innercircumferential surface at a same height as the inner circumferentialsurface of the outer casing, protruding the elastic member mountinghole; a spring fixing member inserted-combined on one side surface ofthe outer supporting protrusion portion; a spring fixing memberinserted-combined on one side of the main frame; and an elastic memberpositioned between the opposed surfaces of the spring fixing members,for elastically supporting the inner casing on the outer casing.
 5. Thestructure of claim 1, wherein a discharge plenum connected with adischarge port, where one or more discharge space is formed, ispositioned on the rear surface of the fixed scroll.
 6. The structure ofclaim 5, wherein a loop pipe for connecting a final discharge space anda discharge pipe of the outer casing is connected-combined at one sideof the discharge plenum.
 7. The structure of claim 1, wherein the lowerend of the driving shaft is formed longer than the lower end of theinner casing.
 8. The structure of claim 1, wherein the elastic member iscomposed of a coil spring.
 9. The structure of claim 6, wherein the looppipe is composed of a spring pipe which has elasticity.